CVE-2026-111881

High

Description

FreeRDP from 3.14.1 before 3.32.0 contains an integer underflow in the WinPR BMP writer, where a mismatched stride calculation passes SIZE_MAX - 3 to Stream_Zero for sub-byte images. A malicious RDP clipboard peer can return a crafted 1-bpp BMP processed by clipboard_synthesize_image_format_to_bmp for CF_DIB/CF_DIBV5, crashing the client or causing an out-of-bounds write.

SeverityHigh

CVSS7.6

Exploit probability—

ProductFreeRDP

PublishedOct 17, 2026

First seenOct 17, 2026

Weakness typeCWE-191CWE-191

How to fix

Update

FreeRDP FreeRDP3.32.0 or later

Vendor advisories

github.com/FreeRDP/FreeRDP/security/advisories/GHSA-27m7-gwhh-6hhf

Affected products

Product	Affected versions	Fixed in
FreeRDP FreeRDP	3.14.1 ≤ v < 3.32.0	3.32.0

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